.canvas-ctn {
  position: relative;
  flex-direction: column;
  flex: 1 1 0%;
  overflow: auto;
  padding: 15px;
  background-color: rgb(236, 236, 236);
}
.canvas-drop-area {
  border: dashed 2px #778;
  width: 100%;
  height: 80px;
  margin-top: 20px;
  line-height: 80px;
  text-align: center;
}